Process for making glass corner tiles



' I Dec. 11, 1935.

s. F. 'MATTMAN;

PROCESS FOR MAKING GLASS CORNER TILES Filed Nov. zz, 1933 Patented Dec. 17, 19 35 PATENT OFFIC rnocnss FOR MAKING GLASS comma TILES Gustave F. Mattman, Cincinnati, Ohio, assignor to The Cincinnati Advertising Products Company, Cincinnati, Ohio, a corporation of Ohio Application November 22, 1933, Serial No. 699,291

4 Claims.

This invention relates in general to a process for bending glass and in particular to a process for producing corner or angle tiles and has for its principal object the provision of a. novel and 6 highly efiicient process adapted to be'practised at a minimum of expense and of timer In the drawing illustrating theinvention, Fig. 1 is a side elevational view of a mold having a glass tile positioned therein and having associated 10 therewith a suitable heat applying device which is shown only in part. Fig. 2 is a View taken on line 2-2 of Fig. 1.

The present invention is adapted to be practised by use of a mold 5 which has a base 6, sides 15 I and inturned top flanges 8 extending longitudinally of the sides. The ends of the mold are open. Extending longitudinally of the base 6 is a vertical support 9 and the top edge of which is disposed in a plane below but adjacent to the 20 end faces of the flanges 8. A pair of stop members I and II are associated with the interior face of the base 6 in spaced relationship with the support 9. These supports may be adjustable to greater heights and to difierent angles than those 25 shown or they may be made removable and replaceable by other stop members of diiierent sizes.

A fiat glass tile I2 is slipped into position between the under faces of the flanges 8 and the 30 top edge of the support 9, assuming the substantially balanced position shown clearly in Fig. 1. It will be noted that the tile is of somewhat less width than the distance between the sides I of the moldin order to allow for expansion of the 85 glass under heat.

' In bending the flat glass tile 12 to the angular form shown in Fig. 1, heat is applied to the median line 20 of the tile'as defined by the top edge of the support, 9. This application of 40 heat may be effected in a suitable manner. For

the purpose of illustration there is herein shown a burner l3 having a restricted elongated jet M which is placed directly above and along the portion of the tile at which the bend is to be effected 45 as seen in Fig. 1. The burner is mounted adjustably on a vertical support l5 and may have associated therewith the air header l6 and the gas header. H which are connected-with the burner by suitable conduits I8 and valves l9 such as shown (Fig. 1). i

The heat is applied alongthe median line as described until the portion of the tile along said line is brought to a bendable condition. At this time the lateral portions of the tile adjacent said 55 median line 20 bend down .of their own weight into predetermined positions below the plane 01' the median portion, the stop members l0 and II limiting this bending movement of said lateral portions. It is obvious that the adjustmentof the stop members or replacement thereof by mem- 5 bers of difierent size, is resorted to for effecting a similar change in the angular relation of the down bent portions of the tile.

The median line portioncf the tile I2 is heated to approximately 1500 F. which is approximately 10 the temperature at which glass attains a bendable state. The lateral portions of the tile bordering the intermediate highly heated portion remain relatively cool and consequently each of said lateral portions remains of itself unbent. The tile after cooling retains permanently the angular shape given it in the process just described.

It should be pointed out, that according to the present invention, the heat is applied to the glass plate on the upper surface and it is the upper surface which must make the greater bend .or are since the lateral portions of the plate are carried downwardly of their own weight. In other words, the outside arc of the bend in the plate i5 necessarily greater than the inside are which contacts the upper edge of the support 9. Thus any danger of breakage of the glass which might occur if the heat were applied to the under side of the glass plate, is effectively obviated.

What is claimed is:

1. The method of forming a glass or similar corner tile and comprising placing a flat tile on a support contacting the tile along an intermediate portion only, applying heat to the opposite 5 surfaceof the tile and along said intermediate supported portion only, and continuing the application of heat until said intermediate portion is in bendable state and the relatively cool portions of the tile on both sides of said intermediate portion bend down of their own weight into angular relationship with one another in predetermined positions below the plane of said intermediate portion.

2. The method of simultaneously bending two sections of a glass or similar plate in one operation to form a corner tile, the method comprising placing the unbent plate on a support which contacts the plate only along an intermediate area on the under surface of the plate leaving clear the space beneath the lateral sections of the plate, and applying heat to the upper surface of the plate in the portions thereof opposite said contacted area of the under surface to render said portions bendable for causing said lateral sec-5s tions of the plate to bend'downwardly of their own weight into the clear spaces therebeneath.

3. The method of simultaneously bending two sections of a glass or similar plate in one operation to form a corner tile, the method comprising placing the unbent plate on a support which contacts the plate only along an intermediate line on the under surface of the plate, applying a flame to the upper surface of the plate along a line opposite said under surface contact line to render bendable the area of theplate along said lines for causing said lateral sections 01' the plate to bend downwardly of their own weight, and limiting the downward bending of said sections when the latter have attained predetermined angles of relationship with one another.

-4. The method of bending a glass plate, comprising placing the unbent plate on a support which contacts the plate only along an intermediate area on the under surface 01' the plate leaving clear the space beneath the lateral sections of'the plate,- and applying heat to the upper surface of the plate alongthe portions thereof opposite said contacted area of the under surface to render said portions bendable for causing the lateral sections of the plate to bend downwardly of their own weight into the clear spaces therebeneath.

GUSTAVE F. MA'II'MAN. 

